This web page summarizes the results for the observation of
Bc -> J/ψ π and
the mass measurement of the Bc meson, based
upon approximately 2.4 fb-1 of data.
The results have been approved as of Nov. 11, 2007. This latest result is an update from previously approved 2.2 fb-1result and 1.1 fb-1result and
0.8 fb-1result that are included in this update.
This result is a separate analysis from earlier work on 0.36 fb-1data.
This work includes that initial 0.36 fb-1 data set and additional data
collected but with a different analysis technique.

Using an unbiased selection with requirements chosen on the basis of enhancing the
reference decay, Bu -> J/ψ K, we apply those same requirements to the region of
interest
in J/ψ π. We observe an excess of events attributed to the Bc meson with a
significance greater than 8σ. We measure the mass of the Bc meson to be:

Mass(Bc) = 6275.6 ± 2.9 (stat) ± 2.5 (syst) MeV/c2

The PRL publication, Phys. Rev. Lett. 100, 182002, 2008 can be found here:
.ps.pdf
A public note summarizing the analysis can be found here:
.ps.pdf
A three page powerpoint summary can be found here:
.ppt.pdf.
A web page for the analysis for CDF collaborators only:
web page

Below are the eps and gif versions of all blessed figures meant for downloads.